For the benefit of all, Cesare sent me the files he produced but did not tell me which one was which.

I was able to determine correctly the 7 megapixel files. There was more detail than the 5 megapixel. However, it was not such a dramatic difference as we might have expected.

Perhaps this is because the lens restricts the ability for the sensor to resolve the extra detail, or just that we are starting to get to a level of detail that is not neccessary except for A3 or even larger prints.

I still believe the Z750 is an excellent camera for the money and at least we can show that there is something extra in the detail for the 7megapixels.